Documents Chapter 43 The Immune System. Concept 43.1: Innate immunity provides broad defenses against...

Chapter 43 The Immune System Concept 43.1: Innate immunity provides broad defenses against infection A pathogen that breaks through external defenses encounters innate cellular…

Documents Immune System An animal must defend itself against unwelcome intruders - the many potentially...

Immune System An animal must defend itself against unwelcome intruders - the many potentially dangerous viruses, bacteria, and other pathogens it encounters in the air, in…